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- Instituto Politécnico de LisboaPT95 papers
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- Instituto de Engenharia de Sistemas e Computadores Investigação e DesenvolvimentoPT16 papers
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43 papers · 1 filter
Non-Canonical Phase-Space Noncommutativity and the Kantowski-Sachs singularity for Black Holes
Catarina Bastos, Orfeu Bertolami, Nuno Costa Dias +1
We consider a cosmological model based upon a non-canonical noncommutative extension of the Heisenberg-Weyl algebra to address the thermodynamical stability and the singularity pro…
Abelian symmetries in the two-Higgs-doublet model with fermions
P. M. Ferreira, Joao P. Silva
We classify all possible implementations of an abelian symmetry in the two-Higgs-doublet model with fermions. We identify those symmetries which are consistent with non-vanishing q…
A Constraint On the Integrated Mass Power Spectrum out to z = 1100 from Lensing of the Cosmic Microwave Background
Joseph Smidt, Asantha Cooray, Alexandre Amblard +4
The temperature fluctuations and polarization of the Cosmic Microwave Background (CMB) are now a well-known probe of the Universe at an infant age of 400,000 years. During the tran…
Observation of shell effects in superconducting nanoparticles of Sn
Sangita Bose, Antonio M. García-García, Miguel M. Ugeda +4
In a zero-dimensional superconductor, quantum size effects(QSE) not only set the limit to superconductivity, but are also at the heart of new phenomena such as shell effects, which…
Extracting the Omega- electric quadrupole moment from lattice QCD data
G. Ramalho, M. T. Pena
The Omega- has an extremely long lifetime, and is the most stable of the baryons with spin 3/2. Therefore the Omega- magnetic moment is very accurately known. Nevertheless, its ele…
The vacuum revealed: the final state of vacuum instabilities in compact stars
Paolo Pani, Vitor Cardoso, Emanuele Berti +2
Quantum fields in compact stars can be amplified due to a semiclassical instability. This generic feature of scalar fields coupled to curvature may affect the birth and the equilib…